Preparation and treatment method for low-sulfur manganese cobalt nickel hydroxide

A hydroxide and treatment method technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of product crystallinity decrease, difficult control of crystallization process, improper synthesis conditions, etc., to achieve improved crystallization degree and excellent electrochemical performance Effect

Inactive Publication Date: 2016-02-03
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared to Ni(OH) 2 , Mn 1-x-y co x Ni y Oh 2 During the preparation process, there are certain differences in the solubility products of the three hydroxides of manganese, cobalt and nickel, and the Mn 2+ and Co 2+ Easily oxidized during synthesis, resulting in Mn 1-x-y co x Ni y Oh 2 The crystallization process i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] First, prepare a mixed salt solution of manganese, cobalt and nickel sulfate with a concentration of 1.0 mol / L (molar ratio Mn:Co:Ni=2:2:6), 5 mol / L NaOH solution and 5 mol / L ammonia solution. The solution was introduced into the reactor in a co-current manner, and the temperature of the reaction was controlled to 55°C, the pH value was 12.5, and the 2 Preparation of spherical Mn under protection 0.2 Co 0.2 Ni 0.6 (OH) 2 . Then prepare 1mol / L NaOH solution, and heat it to 60℃ to rinse the materials. The mass ratio of NaOH solution to the materials used is 5:1, and then use pure water at 60℃ to rinse the materials , The mass ratio of pure water to material is 10:1, the aforementioned NaOH and pure water rinsing are repeated 3 times, and the material is dried to obtain Mn after solid-liquid separation 0.2 Co 0.2 Ni 0.6 (OH) 2 . The S content in the final product is 0.09% by inductively coupled plasma emission spectrometer (ICP).

Example Embodiment

[0026] Example 2

[0027] First, prepare a mixed salt solution of manganese, cobalt and nickel sulfate with a concentration of 3.0 mol / L (molar ratio Mn:Co:Ni=1:1:8), 15 mol / L NaOH solution and 20 mol / L ammonia solution. The solution was introduced into the reactor in a co-current manner, and the temperature of the reaction was controlled to 65°C, the pH value was 13.0, and the 2 Preparation of spherical Mn under protection 0.1 Co 0.1 Ni 0.8 (OH) 2 . Then prepare 5mol / L KOH solution and heat it to 70℃ to soak the material. The mass ratio of the KOH solution to the material is 10:1, and then use pure water at 70℃ to soak the material , The mass ratio of pure water to material is 10:1, the aforementioned KOH and pure water immersion washing is repeated 4 times, the material is dried after solid-liquid separation to obtain Mn 0.1 Co 0.1 Ni 0.8 (OH) 2 . The S content in the final product was 0.06% by ICP test.

Example Embodiment

[0028] Example 3

[0029] First, prepare a mixed salt solution of manganese, cobalt and nickel sulfate with a concentration of 2.0 mol / L (molar ratio Mn:Co:Ni=3:2:5), 2 mol / L NaOH solution and 2 mol / L ammonia solution. The solution was introduced into the reactor in a parallel flow mode, and the temperature of the reaction was controlled to 45℃, pH value 12.0, 2 Preparation of spherical Mn under protection 0.3 Co 0.2 Ni 0.5 (OH) 2 . Then prepare a 2mol / L LiOH solution, and heat it to 80℃ to rinse the materials. The mass ratio of the LiOH solution to the materials used is 20:1, and then use pure water at 80℃ to rinse the materials , The mass ratio of pure water to material is 40:1, the aforementioned LiOH and pure water rinsing are repeated twice, and the material is dried to obtain Mn after solid-liquid separation 0.3 Co 0.2 Ni 0.5 (OH) 2 . The S content in the final product was 0.08% by ICP test.

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PUM

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Abstract

The invention discloses a preparation and treatment method for low-sulfur manganese cobalt nickel hydroxide. According to the method, the crystallization degree of a product is increased by controlling parameters including a pH value and the like in a synthetic process, impurities in a crystal structure are reduced, and the effect of reducing the S content of the product is achieved in a mode of combining special alkali liquor elution with water washing. The S content of a prepared material is low and reaches 0.1%, so that a positive electrode material prepared from a precursor has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a preparation and treatment method of a lithium-ion battery cathode material precursor, that is, low-sulfur manganese-cobalt-nickel hydroxide. Background technique [0002] Lithium-ion batteries have attracted widespread attention due to their high single-cell voltage, high energy density, long cycle life, and no memory effect since they were launched by Sony Corporation of Japan in 1991. They are considered to be one of the batteries with the most potential for development. one. Among the constituent materials of lithium-ion batteries, the positive electrode material occupies an important position, and the quality of the positive electrode material directly determines the performance of the final lithium-ion battery product. Lithium cobaltate (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMn 2 o 4 ), lithium iron pho...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/505H01M4/525
CPCY02E60/10
Inventor 张学全刘亚飞宋顺林
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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